Are your teacher very old?/Is yourteacher very old?谁是正确的?其中有一句不是句子.

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• Are your teacher very old?/Is yourteacher very old?谁是正确的?其中有一句不是句子.
• Are your teacher very old?/Is yourteacher very old?谁是正确的?
• While two detectives were keeping guard at the door.分析一下此句中keep的用法,guard在句中是动词吗?
• All the afternoon he worked in his study with the door .　　A.to lock B.locking C.locked D.lock